<template>
    <div class="cmt-container">
        <h3>发表评论</h3>
        <hr>
        <textarea placeholder="请输入评论内容（最多吐槽120字）" maxlength="120" v-model="msg"></textarea>

        <mt-button type="primary" size="large" @click="postComment">发表评论</mt-button>

        <div class="cmt-list">
            <div class="cmt-item" v-for="(item,i) in comments" :key="item.add_time">
                <div class="cmt-title">
                    第{{ i+1 }}楼&nbsp;&nbsp;用户：{{ item.user_name }}&nbsp;&nbsp;发表时间：{{ item.add_time | dateFormat}}
                </div>
                <div class="cmt-body" >
                    {{ item.content === 'undefined'||item.content === '' ? "此用户很懒...没有留言..." : item.content }}
                </div>
            </div>
        </div>

        <mt-button type="danger" size="large" plain  @click="getMore">加载更多</mt-button>

    </div>
</template>

<script>
import {Toast} from "mint-ui"
export default{

    data(){
        return{
            pageIndex:1,//默认展示第一页的数据
            comments:[],//评论内容
            msg:""//用户最新添加的评论内容
        }
    },
    created(){
        this.getComments();
    },
    methods:{
        getComments(){//获取评论列表
            this.axios
            .get('api/getcomments/'+ this.id + '?pageindex=' + this.pageIndex)
            .then((result) => {
                if(result.data.status === 0 ){
                    //this.comments = result.data.message;
                    //点击加载更多的时候，使用上面的方法，第n页的数据会覆盖第一页的数据，应该使用concat方法拼接数组
                    this.comments = this.comments.concat(result.data.message);
                }else{
                    Toast("获取评论失败");
                }
            })
        },
        getMore(){//加载更多评论
            this.pageIndex++;
            this.getComments();
        },
        postComment(){//提交评论
            if(this.msg.trim().length === 0){
                return Toast('评论内容不能为空!');
            }

            this.axios
            .post('/api/postcomment/' + this.id,{
                content:this.msg.trim()
            })
            .then(result => {
                if(result.data.status ===0){
                    var cmt = {
                        user_name:"匿名用户",
                        add_time:Date.now(),
                        content:this.msg.trim()
                    }
                    this.comments.unshift(cmt)
                    this.msg=''
                }
            })
        }
    },
    props:['id']
}
</script>

<style lang="scss" scoped="">
.cmt-container{
    h3{
        font-size:18px;

    }
    textarea{
        font-size:13px;
        height:85px;
        margin:0;
    }
    .cmt-list{
        margin:5px 0;
        .cmt-item{
            font-size:13px;
            .cmt-title{
                line-height:30px;
                background-color:#ccc;
            }
            .cmt-body{
                line-height:1.8;
                text-indent:2em;
            }
        }
    }
}
</style>